Closed-Loop Wire Rope Monitoring for Retensioning Damage Assessment
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Solution Overview
Problem
Existing maintenance methods for closed-loop wire ropes in lifting and transport devices, such as cranes and cable transport systems, are inefficient and unreliable, particularly due to the difficulty in detecting hidden damage and the need for more reliable and automated preventive maintenance to ensure safe and precise operation.
Innovation Solution
A maintenance assistance method that monitors wire rope retensioning operations, determines elongation values after each retensioning, calculates an overall elongation value, and estimates a damage index based on the number of retensioning operations and time intervals, triggering alerts when the damage index exceeds a predefined threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If visual inspection methods are used to detect wire rope damage, then inspection simplicity is maintained, but detection reliability deteriorates due to inability to detect hidden damage
Solution Approach 1:
The patent replaces manual visual inspection with an automated monitoring system that uses sensors to detect wire rope elongation and calculates damage indices. This mechanical/electronic substitution enables detection of hidden damage through objective measurements rather than subjective visual assessment, resolving the contradiction between inspection simplicity and detection reliability.
Solution Approach 2:
The patent introduces an intermediary damage index calculation system that processes sensor data through specific algorithms (including retensioning operation counting and elongation measurement) to produce reliable damage assessments. This intermediary processing layer transforms raw sensor data into meaningful reliability indicators, enabling accurate detection without direct visual inspection.
2Productivity
If manual inspection methods are used for wire rope maintenance, then system complexity is minimized, but productivity deteriorates due to time-consuming inspection processes
Solution Approach 1:
The monitoring system performs self-assessment of wire rope condition by automatically collecting sensor data, processing it through damage index algorithms, and generating maintenance recommendations without requiring manual intervention. This self-service capability dramatically improves maintenance productivity while the automated nature of the system manages complexity through integration rather than proliferation of components.
Solution Approach 2:
The system implements continuous feedback loops where sensor measurements feed into damage index calculations, which then trigger appropriate maintenance actions. This closed-loop feedback mechanism automates the entire maintenance decision process, improving productivity by eliminating manual inspection cycles while managing complexity through systematic information flow.
3Reliability
If frequent retensioning operations are performed to maintain cable tension, then operational reliability is improved, but wire rope damage accelerates
Solution Approach 1:
The patent implements periodic retensioning operations based on monitored wire rope condition rather than continuous or fixed-schedule retensioning. By using the damage index and elongation measurements to determine optimal retensioning timing, the system maintains cable tension reliability while minimizing unnecessary retensioning cycles that would accelerate wire rope damage and reduce service life.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables reliable and automated preventive maintenance by accurately assessing wire rope damage, ensuring timely replacement and maintaining safe and precise operation of lifting and transport devices.
Implementation Method 1
a wire rope which forms a closed loop and which cooperates with a tensioning system... This retensioning of the closed-loop wire rope is indeed necessary to ensure the proper functioning of the associated moving element... because there will be little or no slack in the cable to take up
Implementation Method 2
In general, wire ropes are subject to fatigue damage. The applicant observed that this fatigue phenomenon is influenced by the tension level in the wire rope, usually induced by the load, and also by the wire rope retensioning operations that occur during the wire rope's service life
Data Source
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Figure 2
AI summary
Maintenance assistance method for assisting the maintenance of a wire rope (32) of a lifting or transport device (1), said wire rope being a wire rope forming a closed loop and cooperating with a tensioning system (4), this maintenance assistance method implementing the following steps: - monitoring the wire rope tensioning operations by the tensioning system; - for each wire rope tensioning operation, determining an elongation value of the wire rope; - estimating an overall elongation value of the wire rope, which corresponds to the sum of the wire rope elongation values determined after each tensioning operation; - determining a damage index of the wire rope as a function of the overall elongation value.